andused, disposingof them properly can make a big impact. san francisco's one of 22 bay area communities with curb side battery recycling programs rviced by recollege >> we're trying to help the city of san fraisco get to zero wast that means san francisco wants to send absolutely nothing to landfill >> reporter: the batteries being unloaded from this truck represent just one day's worth of pickups in san francisco. city residents are responsible for more than two-thirds of the 100-to of batteries recycleed by reecology last year. people are encouraged to leave their batteries in ziploc bags on top of their garbage cans on pick up days. >> they cahave metals in them. you want to keep all of that out of the landfills. >> workers sepate the batteries before they're transported to a smoker and made into different metal products. evenective in reducing waste is using rechargeable batteries. >> erybody is moving in the directn of recrgeable so that that's one step towards being eco friendly. >> reporte even rechargeable batteries can lose their charge. that's why lowe's, staples and radio sha

refund got my money back, i was happy. >>> a new generatio of stethoscopes thatdoctorsusetolisten to your heart and lungs is much more powerful tool. carolyn johnson has our story. >> he is an internist but the specialized stetscope offerings special expertise. >> some of this new technology can do analysis or diagnosis. >> it fits right in the stetdz oh scope. it records the patient's heartbeat and transmits to at computer via a wireless connection. >> the heartbeat is stored as an audio file and wave form graph. they anale the data and the timing of intensity of a heart murmur. >> it's very difficu for physicians to determine which cardiac murmur actually need to be sent to a cardiologist. this software has the ability to screen those out. >> the postable expertise is valuable forthe doctor that perform many of checkups in a mobile examine clinic. >> one of e things we do we send out our team. >> and interactive screen allows assistants to perform exams by walking them through the steps. >> recording protoco complete. >> and the information can be e-mailed to cardiac special ist

here in the bay area, the case is being closely followed. david louietellsuswhat'sat stake. >> reporter: cifornia passed a law five years ago to stop the sale and rental of violent video games to minors. it was blocked by legal challeng and struck down. now it's going to the u.s. supreme court. its author welcome has definive decision. >> it's crying out for some direction as to how we can have a rather succsful video game bill. so i'm really hopeful. >> reporter: the case ll be heard this fall with state attorney general jerry brown arguing such laws should be allowed. on the other side is the entertainment softwar association which represents the video game industry. we talked to spokesman rich taor in washington via skype. >> if for some reason the state of california is able to say what can and can't be sold or marketed, that's not -- the is a reason to believe that stops with one form of entertaient. it could go to movies and books and music. >> reporter: at issue whether violent video games are harmful and whether they should be kept out of the hands of young people